[P123] Add FT6206 Capacitive touch screen and [ESPEasy_TouchHandler] helper

[tonhuisman]

Add support for FT6206 capacitive touch screen, as installed on the WT32-SC01
Resolves #3993
Resolves #3831

Uses an adapted version of the Adafruit FT6206 Library

Functionality similar to P099 XPT2048 resistive touch screen

Introducing ESPEasy_TouchHandler helper module

• Define several button shapes and caption types, on/off state and enable/disable
• Define button groups to form a rudimentary menu system
• Define Slider/Gauge controls
• Handle clicking buttons
• Handle sliding a slider, with 0..100% or min/max value like -10..40 for (room)temperature
• Handle swiping, that can control the menu system
• Added an option to disable the scanning of a Touch-screen, to only use the plugin for handling on-screen buttons
• [P116] Added option for Default font, when AdafruitGFX_Helper has extra fonts included in the build

TODO:

• Documentation
• Testing
• Add support for Button-like functionality, using new ESPEasy_TouchHandler helper
• Remove [TESTING] tag before merge
• Handle storing larger configuration (exceeding 1 kB)